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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b1457290c400684a4d5a0d362e9f25a7f3f88f695fe27b30b56d92b6a50d6e' 
  AND token = 'MgMcuz+rPW7OTWn7mh558gH5WtbW/PhXkzOeGF3MTLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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