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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d69005119613a271170426f64b4ff7826994f6db9a342897ca8a85574bfdcc9' 
  AND token = 'IwNR9cTp4va03NQTAI+9P6bNlxD3sci57Kf+KgLpDJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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