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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837dab9d62aab0cfc0f1bbf0c7c49536c548386cb76fb739c07f12da4aa8d7da' 
  AND token = 'crdy5D/+LrQmYhTpGq0TnMCPfY2vppWWCKjfbMDbwyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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