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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfaff6adcb7dee9067f565715978b3e5b87b1e740b5021a6d96ebd627abd399' 
  AND token = '8xGG/ebdgmIBZy8bWZR2CBhrY2JTqa1gVpX91xgRkNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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