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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a655aa1f68dcfeb14f98a914bcb06f9ad142825cec8d7a4d9e4b1fc944b4a356' 
  AND token = 'R0sM335fH4hq+YrbrKHnIJY1QtELJrx+W2rjTnvWwWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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