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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a362ff70822b56da7fd7fa8b11459ac28113000eac6f3bca63a824f873da22' 
  AND token = 'Yut8tk++Hkwi38WavuAjTxFOXHU+K4JxaxZyF9T4uKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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