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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1dd0419dcb389887137bfbb3c36c750bc32ef1e2cc70498c97a4a1eaa81acf' 
  AND token = 'nA77avujkRw/7+z0Y8wqxePOWJa4rA2LkRYD/NVrFmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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