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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3188803006969c315e813e3ecdba677823e258a37d40e90f44c9f8c26b0a9781' 
  AND token = 'rBb8U9h3CzvCGKIEMzGzGSbvnZhTfHrPq8toiNio6E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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