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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc8462868d3bb92c0e82c0cce6335113d78f658462f046b0c10beecb2852612' 
  AND token = 'TimCoRCCJsvxCYXHE06T7gWeqYv62UQnQgBJTp1QhmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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