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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef192ddf5ee8b378750745475979f686d67c9645081e0e5a511efefc84628057' 
  AND token = 'DT0Uo91uk8Nt/l/DKAQaCBIa8NrrTFFRtTTu4+hf8VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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