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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc311ef5fc2b8b884eaa43dd7df043a93fdd491c2c28545fa47d99002c3308f' 
  AND token = 'fKwipvCLkq8Wo0HOby7h4l1SZDhZOut01mm1QK0LM8o=' 
  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"
    }
  }
}