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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257d58f92058fcf4cc6aa5b302178712733a0f28a3cac47f058847fcc2bb9509' 
  AND token = 'PochEbKllq/OF/bOp5UCY325Hr1pPPnNpz1nYznStEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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