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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffd8d7e3d8e8192e5ac8a68f0d8b0d85ceab0b86009e7eb78825bab8110b6d9' 
  AND token = 'aS/MSu3x61z3as4oJi+LCLjHetn2h/UXfUxxoeK46MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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