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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9d9660c78f630e1c82c2d1b01f55df7110c501428a0020d0269eef04fb6248' 
  AND token = 'hp+jbQ8li2Lk7n6X4r8skPdP+meKl76iaq4dX+12yo8=' 
  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"
    }
  }
}