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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c3c0982d4c89c5d48640db149ef770c8a86ed7787c1b74acae60e25a489d4c' 
  AND token = 'WEjzEbauLBMPQ9sl5+WoBltLzUWD+vCL2BKCY1u2iOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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