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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00a8b35556232b0f02fa76bea36ca6bb67f6e453fd7b50bdcb4b9218eaea549' 
  AND token = 'Y8NLBLFg7ashSX0p3Dr5fcCzLATjj4g40Yrk2BsmC90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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