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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc1f46e545a07b5a4ced0fc35b6d11c686500d3224446c1bf185fa4aa3d2d6d' 
  AND token = 'gdroYuiJ3fZeh+QAPoxms1JJI1UxuciG2SFWswnmGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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