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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd8843aaa464c76cc695eb545bceeda9780e6a38aa303a93977547dfc85fa30' 
  AND token = 'oLl78fmN+7SrcqI0K4aKt5BktY7B2thrvloLfEENrb8=' 
  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"
    }
  }
}