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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f20abf170da43451214584bb49ba6166138309a93d1c6f5f23d03179eed0b33' 
  AND token = 'Rjm1wfz1xa4RYZmSp7flpqUL7eqE9s+1GZu9fywau2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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