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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679531e23cd454be5f6ac0d8c8843876e4fac4b1125ef9abb32e62efc5831cb3' 
  AND token = 'hDyzrkKMQNWil2p5Uy7arhJL/1sv4Et1n6uL27ffMX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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