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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1269ace63a0effa66077ab191a12d0885b531f45f3a306c80e4e7ea32cc44152' 
  AND token = 'UYKEIHJxEX61dHQULesEP2Rt3CEffMLf8yDXrnvqCcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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