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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a58871eac7b9bac2d9de68c764212951ec95d1e26bc6c908315d5d86b5c73d2' 
  AND token = '6jcoq4HR2Iw3/hIICKuuV3CJ+ffj0bMc2tJ3L/bkO0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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