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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd75f89a31f82c4dd3a652a6e574f2c2ff15eff7af7af9fad0cf25fbd50e1082' 
  AND token = 'xP9k8v7bGIZurezqKxf0QloTNuqn0frBUVmUrsy7jIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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