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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db874da2602ece7fb7121b0f7265174058d819229ce7935be98046d9e051e02c' 
  AND token = 's5S9/cwByoB1om/v3apTVoH0j0cyK0H+deCBKjynv/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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