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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3d6dc4c7589ed6d9c57e2c2ada56a0f1a753d5ea135f7010c461e9e14ada29' 
  AND token = 'QkEAmSjb/3igqT6B8da+zfcHPYNDyBXU4el/80EpJow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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