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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24aab53ae7a98e2e98190e58d531ba50685c5bab2c97343d7f8d5be4f1f85f72' 
  AND token = '3hSXm/O9kK71XjecQ0yPY424XRZ8IZXo693HNq1R9Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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