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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44ec9b1476f86d3387e744d01393bb40108ca072e1c85944f325f62dd10ca77' 
  AND token = 'DMoQ+97Uape2/c5LeJ8AwdSrZHUSruUWTqLO4L/gzWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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