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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f4ab94f865687c9a591c163bb47a7672f71ead0380d3d2fd409be5c0b2cc4e' 
  AND token = 'X5iva3zXTac6kdm3MTCGy3esrZYs+ha+SiiDO5rqCbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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