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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfd4c09e0eb2d6f549d51f93dc787dff03045d5075597b6d380b260b63d6305' 
  AND token = 'nu0APOu2Knyf0w3P9N2VRwD1K8eI0HcvqfSSUBQpN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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