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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56a89575f6539ed6c5ab0c795585b7f89d19f0ffa22675c085398169d0ed527' 
  AND token = 'UxNlRPRAPo08Dpr+4c7VPnTughG4Ynv1Qj79wu9Tmyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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