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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632411acf1a9e0e6075995eb175e28f06618859172eb5803a6c4693f2dd5903d' 
  AND token = '9IahkdjtANu59XO7tcIYyD7KTa0zFbYbpOsfH6fu3nc=' 
  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"
    }
  }
}