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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d2be924cb7f5782e46c0db1990ac58242f9b7b0ffae032583ad0e497208989' 
  AND token = '9arr4Rr+4rOD1hTD8sxTVr+13uFnsYNi6W2p76umgaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}