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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb47362ae2ea400d9e31a3ae2c0a71aea01691edb8bdeb49b3ebaa8f952babc3' 
  AND token = 'GkhKRGVEymsb8mYO9RTo80d2E/xH3i25XMmAGCuxUtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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