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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ae087769eedaf051c6a9ec89eb822f83e92050ad2d6df0050c0d62c1d3eca7' 
  AND token = '4cD4fWjFVhSRKebz11bzJ5PgiBzHoDYvPBL1fJ8MLV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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