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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323f822ee860d4905dbbf6acf0c237f7767904b2082b76be1652af3948c1c62a' 
  AND token = 'j/kPAtVCObpFtCaMO0ZOre37TvClwS9rUaO4IppzUDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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