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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f10d0477061f830fa464c90e39660469dc28ee00405d85c00442c9a69f5c24' 
  AND token = 'jGp4AUwZ1smMhczI/+KCCAZv3sQCtmj/GzlC+c5ZihY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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