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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9bbd0a4d6d6f6e87f6f3c326ae000786807f30089ee96fd7d0c3bfcef9c759' 
  AND token = 'whIRQ/qoSmrxzYW/alHrDhQkavrarLxul7FPtZAA4/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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