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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a450fa411c22d0e2cc55341fef18b4be178186588d2e4fc69c480ae00a77b85d' 
  AND token = '69uIQCyCh0Z9/e17bPyLRoaJ3TmAm7rBOW5FtS6S0WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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