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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f92021b88893ded8a56c753a2a00698e59ad31a1620ae08c96c160bfe839563' 
  AND token = 'whVPQuqHOt0eDiuCXKc6rjq0MdAUVPd3V9OXY9FJ+9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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