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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbf2283169621376c0e7f829cc491a9f2e84ebdbbd980000815fe36fb1239f8' 
  AND token = 'P5Y1lo0GHu2g/EDEC+YgZxOWCDUKUdxRJArZ7EL8rDo=' 
  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"
    }
  }
}