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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c0f1b2e6f3aed425b84f815da37709ec10bc53e8734b6cc00a47707684c610' 
  AND token = 'WCu5dyf+giotQHW7ySHVq4e4a29L42fV74OEj+9BTBU=' 
  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"
    }
  }
}